Tarsnap backup script

tarsnap-backup-notification.sh

#!/usr/bin/env bash

## This script assumes that ssmtp is already configured on the server.

KEYFILE="/tmp/tarsnap.key"
EMAIL="[email protected]"
BACKUP_NAME="$(uname -n)-server-backup-$(date +%Y-%m-%d_%H-%M-%S)"
DATA_PATH="/tmp/path1 /tmp/path2"
TOTAL_BACKUPS='3'
EXCLUDE="" #space separated paths if you need multiple exclusions
CACHE_DIR="/usr/local/tarsnap-cache"


## DO NOT EDIT BELOW THIS LINE##

DATE="$(date +%b-%d-%y)"

echo "Backup: $BACKUP_NAME"

TARSNAP="$(which tarsnap)"

EXCLUDE_ARG=""
if [[ "$EXCLUDE" != "" ]]
then
	for file in $EXCLUDE
	do
		EXCLUDE_ARG="$EXCLUDE_ARG--exclude $file "
	done
fi	

# Create the backup
$TARSNAP -c $EXCLUDE_ARG --keyfile $KEYFILE --cachedir $CACHE_DIR -f $BACKUP_NAME $DATA_PATH

BACKUP_STATUS="$?"

ARCHIVE_NUMBER="$($TARSNAP --keyfile $KEYFILE --cachedir $CACHE_DIR --list-archives | sort | wc -l)"

##Limit of three stored backups. If limit is reached, delete the oldest backup

if [ "$ARCHIVE_NUMBER" -gt "$TOTAL_BACKUPS" ]
then
	OFFENDING_BACKUP="$($TARSNAP --keyfile $KEYFILE --cachedir $CACHE_DIR --list-archives | sort | head -1)"
	$TARSNAP -d --keyfile $KEYFILE --cachedir $CACHE_DIR -f "$OFFENDING_BACKUP"
fi

CURRENT_ARCHIVE="$($TARSNAP --keyfile $KEYFILE --cachedir $CACHE_DIR --list-archives | sort)"

if [ "$BACKUP_STATUS" == "0" ]
then
    echo "Backup complete"
    echo "Tarsnap backup completed: $DATE. Current backups: $CURRENT_ARCHIVE" | ssmtp "$EMAIL"
else
    echo "Backup failed"
    echo "Tarsnap backup failed: $DATE". | ssmtp "$EMAIL"
fi